Bench-drill brace.



l. A. LELAND.

BENCH DRILL BRACE.

APPLICATION FILED Nov. 24. 1914.

Patented Oct. 10, 1916.

2 SHEETS-SHEET I.

J. A. LELAND.

BENCH DRILL BRACE.

APPLICATION FILED Nov. 24. 1914.

1 ,200,628. Patented Oct. O, 1916.

2 SHEETS-SHEET 2.

Pulg. 11 l 3 40 represents a section on JOHN A. LELAND, OF MONTAGUE,

COMPANY, OF MILLERS FALLS, MASSACHUSETTS,

CHUSETTS.

BENCH-DRILL BRACE.

i Specification of Letters Patent.

MASSACHUSETTS, ASSIGNOB TO MILLERS FALLS A CORPORATION F MASSA- Patented Oct. 10, 1916.

Application led November 2,4, 1914. Serial No. 873,742.

To all whom t may concern.'

Be it known that I, JOHN A. LELAND, a citizen of the United States, and resident of Montague, in the county of Franklin and State of Massachusetts, have invented certain new and useful Improvements in Bench- Drill Braces, of which the following is a specification. v

This invention relates to appliances or 1c tools for operating drills, the operation being effected by hand, such devices being commonly known as drill braces, the present invention relating to such tools or appliances that are intended to be secured to a i5 bench or table in position for manual operation.

One of the objects of my invention is to provide an improved feed mechanism for automatically7 effecting the downward feed v2o movement of the drill or other tool, the

mechanism including means for varying the amount of feed of the tool in relationship to the number of its rotations.

A further object is to provide an implement of this character having improved changed speed mechanism to enable the tool to be operated at eitherY one of a plurality of different speeds of rotation.

With these and further ob]l ectsin view, my invention consists in the improvements which I shall now proceed to describe and claim.

Of the accompanying drawings: Figure 1 is a side elevation of a tool or implement constructed according to my invention, said ligure omitting the lower portion of the frame and means for supporting or clamping the appliance in position for use; Fig. 2 is an elevation from the other side'from that of Fig. 1, parts being broken out; Fig. 3 line 3-3 of Fig. 1, on a larger scale; Fig. A is a perspective view of the different parts of the coupling shown in Fig. 3, said parts being separated from each other; Fig. 5 represents a section on line 5-5 of Fig. 1, on a larger scale; Fig. 6 is a view similar to Fig. 5, but illustrating a different position of the'bolts or dogs used for changing the speed of the gearing; Fig. 7 represents a section on line 7-7 of Fig. 5; Fig. S is a perspective view of one of the pinions shown in Fig. 5,it being understood that the other vpinion is similarly formed; Fig. '9' is a perspective view of the two sleeves employed for effecting a change of speed; Fig. 10 is a perspective view of the clutch hub of the change speed gearing, the bolts or dogs being included in said gure but removed from their position of use; Fig.

.11 represents a section online 11-11 of Fig. 2, on a larger scale;'Fig. 12 is a view similar to a 1 portion of Fig. 11, showing a different position of the pawl which actuates the feed screw; Fig. 13 is a perspective view of 'the different parts, prise the means for separated, which comvarying the operation of the pawl which actuates the feed screw; Fig. 14: represents a section on line 14-14 of Fig. 11; Fig. 15 represents a section on line 15-15 of. Fig. 2, on a larger scale, said figure showing also a ried. by `one of the ge Similar reference portion 'of the cam carars.

characters represent similar parts in all of the views.

A frame 20, having suitable means not illustrated for securing it to a bench or elsewhere for use, has its upper portion formed to provide three bearings 21, 22,

23, in alinement with each other, a spanning portion 24 providing for the support of a stud or shaft 25 (see Figs. 1 and 2). These parts may b e all of a single casting.

Mounted on or rotating with the stud 25 is a compound gear having an inner series of gear teeth 26 and an outer series of gear teeth 27. A crank 28 having a suitable handle is connected in any preferred manner to enable the compound gear to be manually rotated.

Mounted in the bearings 21, 22, is a tool spindle 29 having a chuck 30 for holding the drill or other tool.

Loosely mounted on the spindle 29 are two pinions 31, 32, with the gear gear.

it will be seen that meshin' res nectivel teeth 26, 27, of thc compound Referring to Figs. 5 to 8 inclusive,

the pinions 31 and-32 are provided with cylindrical shoulders 33,

the same being bisected 3A adapted to receive presently described.

by slots or recesses the bolts or dogs A clutch hub 35 is directly mounted upon the spindle 29 and is secured thereto by groove 37 in the spin a direct connection between a spline 36 entering a dle. This provides for the hub and the spindle, although the spindle is adapted to be moved or adjusted longitudinally, as hereinafter described.

As best shown in hub is provided with Fig. 10, the clutch a longitudinal socket 38 in which are mounted two bolts `or-dogs 39, 40, a spring 41 (see also Figs. 5 and 6) being located between the two dogs so as to project either one of them, when permitted, into engagement with a recess 34 of one of the two pinions.

In order to selectively control the two dogs for the purpose of rendering either one of the pinions 31, 32, operative, the said dogs are provided with pins 42 which project into slots formed in one side of a sleeve 43 which is mounted to rotate about the clutch hub 35. The ends of this sleeve 43 surround the cylindrical shoulders 33 of the two pinions. The slots in the sleeve 43 are formed with cam walls 44, 45 (Fig. 9). Mounted upon the inner sleeve 43 is an outer sleeve 46 connected to the inner sleeve by suitable means such as a lug 47 and recess 4S, so that when the outer sleeve 46, the outer surface of which is preferably milled or roughened, is rotated, it will insure corresponding rotation of the inner sleeve 43 so that the cam edges 44, 45, of the slots in the inner sleeve, will control which of the bolts or dogs 39, 40, shall be projected. This is clearly illustrated by comparing Figs. 5 and 6. In Fig. 5 a dog 39 is engaged with the pinion 31 and therefore said pinion 31 is locked to the spindle 29 while the other pinion 32 is left idle. Since the pinion 31 meshes with the gear teeth 26 of the compound gear, rotation of the latter by means of the crank will impart to the spindle its lesser speed of rotation. By rotating the sleeves so that the dog 39 is withdrawn andthe dog 40 is permitted to be projected by the spring 41, the said dog 4() will interlock with the pinion 32, the pinion 31 at the same time being left idle. Operation of the compound gear then imparts the higher speed of rotation to the spindle because the pinion 32 meshes with the outer larger series of gear teeth 27. The movements just described are supposed to mean movements of the dogs to their eXtreme inner or outer positions. 1f the sleeve 43 is moved only to an intermediate position so that the pins of the dogs bear against about the midlengths of the cam walls 44, 45, then both ofthe dogs will project sufliciently so that both of the pinions 31, 32, are locked to the clutch hub, thus locking the spindle so that the clutch can be conveniently opened and closed for the substitution of tools. This locking of the spindle is due to the fact that if both pinions 31, 32, are locked to the spindle through the medium of the clutch hub and its bolts or dogs, the engagement of the two gears 26, 27, with the two pinions, will necessarily effect this locking because of the dierent sizes of the said two gears 2-6, 27.

The vertical aperture in the upper bearing 23 is internally threaded (see Fig. 14),

a construction best illustrated in Figs. 3 and 4. These figures are drawn horizontally, but it will be understood of course that in practice the implement is usually employed while the spindle is in vertical position, although such position of course is not always necessary. The inner end of the feed screw 49 is reduced as at 51, this portion entering a socket 52 in the end of the spindle 29. This reduced portion is formed or provided with an annular groove 53. One side of the socket 52 is slotted as at 54, a key piece 55 being located in said slot and engaging the annular groove 53. The key piece is held in place by a split spring sleeve 56.

It will now be understood that the tool spindle 29 can be freely rotated at any speed by the gearing described, although the feed screw 49 is only rotated intermittently as herein described. Preferably a ball bearing is provided between the tool spindle and the feed screw, the same being illustrated as comprising balls 57 between two bearing rings 58, 59.

As illustrated by comparing Figs. 3 and 4 with Fig. 1, the tool spindle and feed screw may be readily connected by the coupling, or disconnected, because of the coupling being accessible in the space between. the frame bearings 22, 23. Assembling of the parts, or separating them for such purposes as cleaning, is easily effected. By simply springing the sleeve 56 open, and removing the key piece 53, the coupling is separated, and the tool spindle can then be slipped out of the bearings 21, 22, and out of the' changespeed gearing, and the feed screw can be then removed from the threaded bearing 23 by rotating it.

Mounted in the recess at the upper end of the bearing 23 is a ratchet ring 60 (Figs. 11q 12 and 14), said ring being held in said re! cess so that'it can have no vertical movement, by a strip 61 held by suitable means such as one or more screws 62 (Figs. 1 and 2). The ratchet ring is connected to the feed screw by means of a spline 63 carried by the former entering a vertical groove 64 in the latter. This prevents the feed screw from having any movement except when the ratchet ring is rotated. The ratchet ring is actuated by a pawl carried by a slide 65 (Figs. 2, 11, 12 and 14), said slide having at one end a hollow stud 66 the outer end of which is provided with a transverse groove 67 (Fig. 13).

A pin 68 is mounted 13o 1n the hollow stud 66 and vhas a heady69 at its inner end, which takes a bearing against the inner wall of the said stud. Projecting from the inner face of the head 69, at one side of the center thereof, is a rib which constitutes the pawl for actuating the ratchet ring. Secured to the end of the pin 68 which projects from the stud 66 is a knob or button 71 preferably having a milled'periphery. VSaid knob is provided with two lugs 72 adapted to engage the groove 67. It is to be understood that the stud 66 having the groove 67 is fixed so that it cannot rotate. A spring 73 tends to normally hold the pin 68 with the pawl in engagement with the teeth of the ratchet ring.

Explainingl at this point that by the mechanism hereinafter described the pawl slide 65 is always given a certain amount of reciprocation, it will befunderstood that when the pin 68 is so turned that the pawl 70 occupies the position shown in Fig. 11, the pawl will impart as much movement to the ratchet ring as is possessed by the slide 65. This is supposed to actuate the feed screw at its maximum speed of advance or downwardmovement during work. If a slower advance of the feed screw is desired, the user withdraws the pin 68 slightly against the action cf the pin 7 3, by means of the knob 71, and then gives the pin a one-half turn, then permitting the lug 72 to return again into the groove 67. This turns the pin so that the pawl 70 is at the other side of the center of rotative adjustment of the pin, as shown by Fig. 12, so that thereafter, when the before-mentioneduniform extent of movement is imparted to the slide 65, the ratchet ring will not be actuated so far, a considerable amount of movement of the pawl being then simply lost motion. This structure provides for a'quick change from high to low feed, and vice versa.

If the knob 71 be given less than the half-turn above described, and then released, the lugs7 2 cannot enter the groove 67, and consequently the pawl 70 is held out of engagement with the ratchet, thus leaving the feed screw free to be rapidly rotated by means of its handle 50.

To automatically reciprocate the pawl slide 65 so that the feed screw will be intimately actuated whenever the appliance is in use, Iprovide an elbow lever having arms 74, 75 (see Figs. 1 and 2). Said lever is pivoted to the frame at 76. The tip 77 of the arm 74 is rounded and carries a pin or screw 78 (Fig. 11), said pin entering a recess 79 in the upper portion of the frame. A spring 80 confined between the inner end of the said recess and the pin 78 acts to cause the arm 74 of the elbow lever to normally hold the pawl slide retracted. The connection is such that all movements of the elbow lever are imparted to the pawl slide. The

end lof they arm 75 vof vthe elbow lever is provided witha pin 81 (Fig. 15') on which 1s mounted a roll 82, said roll engaging an inner eccentric face 83 carried by the compound gear, said eccentric face constituting a cam so that each rotation of the compound gear by means of the crank causes one complete voscillation of the elbow lever and consequently causes one complete reciprocation of the pawl Vslide so that the pawl will give one step'movement to the ratchet ring 60, and thus cause the feed screw to advance the tool spindleV and carry the tool slightly farther intoy the work. v

Owing to the coupling between the ends of tool spindle 29 and feed screw 49, the tool can be quickly raised without imparting any rotation to it. This is done by turning the feed screw by means of its handle 50, the pawl 70 being held out of the way of the teeth of the ratchet ring by means of its knob 71. f

Having described my invention, I claim:

1.'An implement of the character described, comprising a frame having bearings, a toolspindle rotatably and longitudinally movable in said bearings, gearing for rotating the spindle, f a feed c screw coupled to said spindle, a ratchet ring having a splined connection with the feed screw, 5

a slide mounted in the frame, a pawl carried by the slide for actuating said ratchet ring, and means for automatically reciprocating the slide when the tool spindle is rotated.

- 2. An implement of the character deA scribed, comprising a frame having bearings. a tool spindle rotatably and longitudinally movable in said bearings, gearing for rotating the spindle, a feed screw coupled to said spindle, a ratchet ring having a splined connection with the feed screw, a slide mounted in the frame, a pawl carried by the slide for actuating said ratchet ring, and means for automatically reciproeating the slide when the tool spindle is rotated, said means comprising an elbow lever pivoted to the frame and engaging the slide, and a cam for actuating said lever.

3. AnV implement of the character described, comprising a frame having bearings, a tool spindle rotatably and longitudinally movable in said bearings, gearing for rotating the spindle, a feed screw coupled to said spindle, a ratchet ring having a splined connection with the feed screw. a slide mounted in the frame, a hollow stud carried by the slide, a pawl adjustably mounted in the stud and engaging said ratchet ring, and means for automatically reciprocating the slide when the tool spindle is rotated.

4. An implement of the character described, comprising a frame having bearings, a tool spindle rotatably and longitudinally movable in said bearings, gearing for rotating the spindle, a feed screw coupled to said spindle, a ratchet ring having a splined connection with the feed screw, a slide mounted in the frame, a hollow stud carried by the slide, a pawl adjustably mounted in the stud and engaging said ratchet ring, means being provided for setting and holding the pawl out of engagement with the ratchet ring, and means for automatically reciprocating the slide when the tool spindle is rotated.

5. An implement of the character described, comprising a frame having bearings, a tool spindle rotatably and longitudinally movable in said bea-rings, gearing for rotating the spindle, a feed screw coupled to said spindle, a ratchet ring having a splined connection with the feed screw, a slide mounted in the frame, a hollow stud carried by the slide and having a transverse groove in its outer ends, a pin mounted in said stud and having a rib at its inner end to engage the ratchet ring, a spring to press said pin inwardly, a knob secured to the outer end of the pin and having a lug to engage the groove of the stud, and means for automatically reciprocating the slide when the tool spindle is rotated.

6. 'An implement of the character described, having a frame provided with bearings, a tool spindle rotatably and longitudinally movable in said bearings, gearing for Copiesof this patent may be obtained for ve cents cach, by addressing the rotating it, a feed screw coupled to said spindle, a ratchet ring having a splined connection with the screw, a slide, a springpressed pin carried by said slide and engaging said ratchet ring, means for automatically operating the pin when the tool spindle is rotated, and means for varying the action of said pin to change the speed of longitudinal movement of the tool spindle.

7. An implement of the character described, comprising a frame having bearings, a tool spindle rotatably and longitudinally movable in said bearings, gearing for rotating the spindle, a feed screw coupled to said spindle, a ratchet ring having a splined connection with the feed screw, a slide mounted in the frame, a pawl carried by the .slide for actuating said ratchet ring, the frame having a recess behind the slide, the slide having a pin projecting into said recess, a spring in the recess acting on the pin of the slide to move the latter in one direction, an elbow lever engaging the slide, and a cam carried by the spindle-rotating gearing for actuating the lever to move the slide in the other direction.

In testimony whereof I have afiXed my signature, in the presence of two witnesses.

JOHN A. LELAND.

Witnesses L. B. STRACHAN, LENA PERKINS.

Commissioner of Patents,

Washington, D. C. 

